Some more groups got LEDs to light:
Another group was able to power a calculator:
I experimented with a new version of the aluminum/bleach battery:
It produced about 60 mA at 4.5V.
Another version of the copper-aluminum-bleach battery used baggies. It was able to run a small motor, but it had some leakage issues.
8.2V! The voltage slowly increased with use...
Mr. Peloquin opened up a 9V alkaline battery, and showed how it composed of multiple cells...
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